This discount is automatically applied and can be seen in 2 places during the checkout process:

On the Cart page, above the Cart Items, there will be boxes that show all discounts applied as shown in the screenshot below

On the Cart and Checkout pages in the “Discount” area, right above the “Grand Total” as shown in the screenshot below

How to Use Coupon Codes:

To take advantage of Coupon Codes, just enter the Coupon Code during the checkout process. Make sure to type the code just like it's shown or the system won't recognize it. All Coupon Codes are caps, space and alpha/numeric sensitive.

There are 2 different places that you can enter your Coupon Code - use whichever you prefer. There are pictures of each below.